1 /*
 2  * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.
 3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 4  *
 5  * This code is free software; you can redistribute it and/or modify it
 6  * under the terms of the GNU General Public License version 2 only, as
 7  * published by the Free Software Foundation.
 8  *
 9  * This code is distributed in the hope that it will be useful, but WITHOUT
10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12  * version 2 for more details (a copy is included in the LICENSE file that
13  * accompanied this code).
14  *
15  * You should have received a copy of the GNU General Public License version
16  * 2 along with this work; if not, write to the Free Software Foundation,
17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18  *
19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20  * or visit www.oracle.com if you need additional information or have any
21  * questions.
22  *
23  */
24 
25 /*
26  * @test id=passive
27  * @requires vm.gc.Shenandoah
28  *
29  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahRegionSampling
30  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
31  *      -XX:+ShenandoahDegeneratedGC
32  *      TestRegionSampling
33  *
34  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahRegionSampling
35  *      -XX:+UseShenandoahGC -XX:ShenandoahGCMode=passive
36  *      -XX:-ShenandoahDegeneratedGC
37  *      TestRegionSampling
38  */
39 
40 /*
41  * @test id=adaptive
42  * @requires vm.gc.Shenandoah
43  *
44  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahRegionSampling
45  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=adaptive
46  *      TestRegionSampling
47  */
48 
49 /*
50  * @test id=static
51  * @requires vm.gc.Shenandoah
52  *
53  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahRegionSampling
54  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=static
55  *      TestRegionSampling
56  */
57 
58 /*
59  * @test id=compact
60  * @requires vm.gc.Shenandoah
61  *
62  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahRegionSampling
63  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=compact
64  *      TestRegionSampling
65  */
66 
67 /*
68  * @test id=aggressive
69  * @requires vm.gc.Shenandoah
70  *
71  * @run main/othervm -Xmx1g -Xms1g -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+ShenandoahRegionSampling
72  *      -XX:+UseShenandoahGC -XX:ShenandoahGCHeuristics=aggressive
73  *      TestRegionSampling
74  */
75 
76 public class TestRegionSampling {
77 
78     static final long TARGET_MB = Long.getLong("target", 2_000); // 2 Gb allocation
79 
80     static volatile Object sink;
81 
82     public static void main(String[] args) throws Exception {
83         long count = TARGET_MB * 1024 * 1024 / 16;
84         for (long c = 0; c < count; c++) {
85             sink = new Object();
86         }
87     }
88 
89 }